<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        body {
            height: 2000px;
        }
        /* div.outer {
            width: 300px;
            height: 300px;
            background: yellowgreen;
            position: relative;
        }
        
        div.inner {
            width: 100px;
            height: 100px;
            background: red;
            position: absolute;
            padding: 10px;
            border: 3px solid;
            margin: 4px;
        } */
    </style>
</head>

<body>


    <button>1</button>
    <button>2</button>
    <button>3</button>



    <script>
    </script>
</body>

</html>